HI Mel,
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See my earlier message with a similar issue.
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I had that distortion and then turned off predistortion etc. and it improved.
I re-ran the calibration and then is was OK ( for a bit ) and now have distortion again.
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I don't have time to perform more rigorous testing/recording conditions, but I will post again when I do.
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72 Simon G0FOZ
Si Smith